Very faint clicking noise when BP breathes?

I noticed yesterday when handling Noodles that she was making a very faint clicking noise when she's breathing. The only reason I even heard it was because she stretched up onto my glasses and rested on my ear afterwards. I took her and listened closer and it was very faint but definitely a clicking sound. I know this can be a sign of an RI, so I checked her mouth and didn't see any mucus, no bubbles, and there is no discoloration in or around her mouth/nose. She isn't rubbing her face in her enclosure and there aren't any mucus smudges on the glass. So what i'm wondering is if a slight, very faint clicking is normal, or is it's the beginning of an RI? I'll absolutely bring her to the vet if I have to, but wanted some advice first. Any help is appreciated! :)

She's in a 20G enclosure
Her substrate is a cypress/aspen blend
Clean water every day
I spot clean when needed and clean/disinfect everything once a month
She has three hides, one on the cold side, one in the middle, and one on the hot side
Her temps are 76-78, 80-82, and 89-91
Her humidity stays anywhere between 55% and 65%
I've had her for three months and she was never missed a meal, she's on rat pups
She sleeps all day and comes out for a while at night, usually basking on the branch I have in her enclosure, does a tour of her home, and goes back to sleep.

Could she be going into shed or have a bit of shed stuck in her nostrils?

No stuck shed that I can see and she shed exactly one month ago today actually, so her going into another shed is possible. Although, she doesn't have a pink belly yet...And the last time she shed her belly was PINK! Just wondering why her going into a shed affect her breathing? Haven't heard that before. :)

Yes it can. :)

The fluid between the layers and the extra layer itself can narrow the nostril enough to make pops and wheezes.

Thanks! I had no idea... I'll keep an eye on her for the next few days and hope she starts to get pink or goes into blue. :) (last time she was pink for like, half a day and then BAM, she was in blue lol) If it's not her going into a shed, is there anything else it could be besides an RI?